6.1

CVSS Score

3.0

-

CVSS Score

Basic Information

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CVE-2018-3824

CVE-2018-3824: Elasticsearch subject to cross site scripting

X-Pack Machine Learning versions before 6.2.4 and 5.6.9 had a cross-site scripting (XSS) vulnerability. If an attacker is able to inject data into an index that has a ML job running against it, then when another user views the results of the ML job it could allow the attacker to obtain sensitive information from or perform destructive actions on behalf of that other ML user.

(GitHub Advisory)

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CVE-2018-3824

CVE-2018-3824:

6.1

CVSS Score

3.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
org.elasticsearch:elasticsearch	maven	< 5.6.9	5.6.9
org.elasticsearch:elasticsearch	maven	>= 6.0.0, < 6.2.4	6.2.4

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability requires two key runtime behaviors: 1) Processing of attacker-controlled data from ML job indices, and 2) Output generation without proper escaping. The identified functions are core components of Elasticsearch's ML results pipeline:

TransportGetResultsAction.doExecute is the entry point for results retrieval requests. It would appear in stack traces when users view ML job results.
JobResultsProvider.processBuckets handles low-level data extraction from stored ML results. Both would handle raw attacker data before any escaping occurs.

While exact patch details are unavailable, the CVE description explicitly ties the vulnerability to ML job result viewing. These functions represent the most probable locations where unescaped data would flow from document storage to HTTP responses in affected versions. Confidence is medium due to reliance on architectural patterns rather than explicit patch analysis.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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